Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 305)

Publication AG-UM008C-EN-P - February 2005
Configuring Modems 8-39
Power Line Modem
Configurations
Power line modems can also be used for SCADA applications. Instead
of using dedicated lines to transmit data, power line modems are
wired directly to existing ac cables in the plant or factory. You need
only a power-delivery medium and an RS-232 interface.
When communicating with Allen-Bradley programmable controllers
using power line modems, configure the modems according to the
specifications in this section.
Figure 8.25 Typical power line modem configuration
DATA-LINC Group LCM100 Line Carrier Modem
Interfacing with Allen-Bradley equipment using facility power lines,
the LCM100 permits full duplex asynchronous data communication
over 120VAC or 240 VAC power lines at data rates up to 9600 baud. A
system consisting of a master and a remote at ranges up to 800 feet
through wire. The LCM100 can be configured for RS-232 or
RS-422/485 communications. Communication through sliding contacts
and brushes is possible with the LCM100.
Connection to the LCM100 is through the DB-25 female connector and
the 3-wire AC powerjack located on the back of the unit.
PC with RS-232
interface card
master modem
Existing ac power line remote modem
Aerator
Deck
Clarifying
Deck
Clarifying
Deck
IMPORTANT
The LCM100 installation must include a PLI500
Power Line Isolator.